document.write( "Question 84581: Steve traveled 600 miles at a certain speed. Had he gone 20mph faster, the trip would have taken 1 hour less. Find the speed of his vehicle. \n" ); document.write( "
Algebra.Com's Answer #62743 by Flake(45)\"\" \"About 
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let S = Speed
\n" ); document.write( "let T = Time
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\n" ); document.write( "equation-1: 600 = ST
\n" ); document.write( "equation-2: 600 = (S+20)(T-1)\r
\n" ); document.write( "\n" ); document.write( "So ST=(S+20)(T-1)
\n" ); document.write( "ST = ST - S + 20T-20
\n" ); document.write( "S = 20T-20\r
\n" ); document.write( "\n" ); document.write( "Substitude S.
\n" ); document.write( "600 = ST
\n" ); document.write( "600 = (20T-20)T
\n" ); document.write( "600 = 20T^2 - 20T
\n" ); document.write( "\"20T%5E2-20T-600+=+0+\"
\n" ); document.write( "Solve with \"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
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